title: Recovering a fiber Bragg grating axial strain distribution from its reflection spectrum.
abstract: A processing scheme able to obtain any arbitrary intragrating strain distribution of a fiber Bragg grating (FBG) is proposed and demonstrated. The processing method employs just the intensity of the FBG reflection spectrum to obtain its deformation profile by combining a geometrical processing scheme with the particle swarm optimization technique. The technique has been evaluated using several spectra generated from very heterogeneous strain distributions and with a real spectrum obtained from a 5 mm length FBG under an asymmetric perturbation. The achieved results exhibit a good spatial resolution (Δ≈0.5 mm) and repeatability.
authors.affiliation: Photonics Engineering Group, University of Cantabria, Av. Los Castros, Santander 39005, Spain. luis.rodriguez@unican.es
authors.forename: L
authors.initials: L
authors.lastname: Rodriguez-Cobo
authors.forename: A
authors.initials: A
authors.lastname: Cobo
authors.forename: J M
authors.initials: JM
authors.lastname: Lopez-Higuera